1. Products
  2. A/D Converters (ADC)
  3. High Speed A/D Converters >10 MSPS
  4. Standard High Speed A/D Converters
  5. AD9644


Features and Benefits

  • JESD204A coded serial digital outputs
  • SNR = 73.7 dBFS at 70 MHz and 80 MSPS
  • SNR = 71.7 dBFS at 70 MHz and 155 MSPS
  • SFDR = 92 dBc at 70 MHz and 80 MSPS
  • SFDR = 92 dBc at 70 MHz and 155 MSPS
  • Low power: 423 mW at 80 MSPS, 567 mW at 155 MSPS
  • 1.8 V supply operation
  • IF sampling frequencies to 250 MHz
  • Integer 1-to-8 input clock divider
    −148.6 dBFS/Hz input noise at 180 MHz and 80 MSPS
  • -150.3 dBFS/Hz input noise at 180 MHz and 155 MSPS
  • Please see data sheet for additional features

Product Details

The AD9644 is a dual, 14-bit, analog-to-digital converter (ADC) with a high speed serial output interface and sampling speeds of either 80 MSPS or 155 MSPS.

The AD9644 is designed to support communications appli-cations where high performance, combined with low cost, small size, and versatility, is desired. The JESD204A high speed serial interface reduces board routing requirements and lowers pin count requirements for the receiving device.

The dual ADC core features a multistage, differential pipelined architecture with integrated output error correction logic. Each ADC features wide bandwidth differential sample-and-hold analog input amplifiers that support a variety of user-selectable input ranges. An integrated voltage reference eases design consid-erations. A duty cycle stabilizer is provided to compensate for variations in the ADC clock duty cycle, allowing the converters to maintain excellent performance.

By default, the ADC output data is routed directly to the two external JESD204A serial output ports. These outputs are at CML voltage levels. Two modes are supported such that output coded data is either sent through one data link or two. (L = 1; F = 4 or L = 2; F = 2). Independent synchronization inputs (DSYNC) are provided for each channel.

Flexible power-down options allow significant power savings, when desired.

Programming for setup and control is accomplished using a 3-wire SPI-compatible serial interface.

The AD9644 is available in a 48-lead LFCSP and is specified over the industrial temperature range of −40°C to +85°C.

This product is protected by a U.S. patent.

  • Communications
  • Diversity radio systems
  • Multimode digital receivers (3G and 4G)
  • I/Q demodulation systems
  • Smart antenna systems
  • General-purpose software radios
  • Broadband data applications
  • Ultrasound equipment
Product Highlights
  1. An on-chip PLL allows users to provide a single ADC sampling clock; the PLL multiplies the ADC sampling clock to produce the corresponding data rate clock.
  2. The configurable JESD204A output block supports up to 1.6 Gbps per channel data rate when using a dedicated data link per ADC or 3.2 Gbps data rate when using a single shared data link for both ADCs.
  3. Proprietary differential input that maintains excellent SNR performance for input frequencies up to 250 MHz.
  4. Operation from a single 1.8 V power supply.
  5. Standard serial port interface (SPI) that supports various product features and functions, such as data formatting (offset binary, twos complement, or gray coding), enabling the clock DCS, power-down, test modes, voltage reference mode, and serial output configuration.

Product Lifecycle icon-recommended Recommended for New Designs

This product has been released to the market. The data sheet contains all final specifications and operating conditions. For new designs, ADI recommends utilization of these products.

Evaluation Kits (1)

Documentation & Resources

  • View All (17)
  • Evaluation Design Files (1)
  • Data Sheets (1)
  • Application Notes (9)
  • User Guides (1)
  • Informational (1)
  • Technical Articles (3)
  • Videos (1)
  • Application Notes

    Tools & Simulations

    Virtual Eval - BETA

    Virtual Eval is a web application to assist designers in product evaluation of ADCs, DACs, and other ADI products. Using detailed models on Analog’s servers, Virtual Eval simulates crucial part performance characteristics within seconds. Configure operating conditions such as input tones and external jitter, as well as device features like gain or digital down-conversion. Performance characteristics include noise, distortion, and resolution, FFTs, timing diagrams, response plots, and more.


    Design Tools


    ADIsimRF is an easy-to-use RF signal chain calculator. Cascaded gain, noise, distortion and power consumption can be calculated, plotted and exported for signal chains with up to 50 stages. ADIsimRF also includes an extensive data base of device models for ADI’s RF and mixed signal components.

    Visual Analog

    For designers who are selecting or evaluating high speed ADCs, VisualAnalog™ is a software package that combines a powerful set of simulation and data analysis tools with a user-friendly graphical interface.

    Product Recommendations

    AD9644 Companion Parts

    Recommended Clock Drivers

    Recommended Driver Amplifiers

    Recommended VGA's

    • For an ultralow distortion, IF dual channel VGA: AD8376.
    • For an independent, dual channel, digitally controlled VGA: AD8372.

    Design Resources

    ADI has always placed the highest emphasis on delivering products that meet the maximum levels of quality and reliability. We achieve this by incorporating quality and reliability checks in every scope of product and process design, and in the manufacturing process as well.  "Zero defects" for shipped products is always our goal.View our quality and reliability program and certifications for more information.

    Part Number Material Declaration Reliability Data Pin/Package Drawing CAD Symbols, Footprints & 3D Models
    AD9644BCPZ-155 Material Declaration Reliability Data 48-Lead LFCSP (7mm x 7mm x 0.85mm w/ EP)
    AD9644BCPZ-80 Material Declaration Reliability Data 48-Lead LFCSP (7mm x 7mm x 0.85mm w/ EP)
    AD9644BCPZRL7-155 Material Declaration Reliability Data 48-Lead LFCSP (7mm x 7mm x 0.85mm w/ EP)
    AD9644BCPZRL7-80 Material Declaration Reliability Data 48-Lead LFCSP (7mm x 7mm x 0.85mm w/ EP)
    AD9644CCPZ-80 Material Declaration Reliability Data 48-Lead LFCSP (7mm x 7mm x 0.85mm w/ EP)
    AD9644CCPZRL7-80 Material Declaration Reliability Data 48-Lead LFCSP (7mm x 7mm x 0.85mm w/ EP)
    Wafer Fabrication Data

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